#457E7B

CSS

:root {
  --turquoise-tortoise: #457e7b;
  --turquoise-tortoise-rgb: 69 126 123;
  --turquoise-tortoise-oklch: oklch(0.553 0.06 191.2);
}

.element {
  color: var(--turquoise-tortoise);
  background-color: hsl(177 29% 38%);
  border-color: oklch(0.553 0.06 191.2);
}

Tailwind CSS v4

@theme {
  --color-turquoise-tortoise: #457e7b;
  --color-turquoise-tortoise-50: #e2fbfa;
  --color-turquoise-tortoise-100: #d2efed;
  --color-turquoise-tortoise-200: #b8dddb;
  --color-turquoise-tortoise-300: #94c2c0;
  --color-turquoise-tortoise-400: #74aaa7;
  --color-turquoise-tortoise-500: #539390;
  --color-turquoise-tortoise-600: #477c7a;
  --color-turquoise-tortoise-700: #396461;
  --color-turquoise-tortoise-800: #284947;
  --color-turquoise-tortoise-900: #1b3331;
  --color-turquoise-tortoise-950: #0b1e1d;
}

SCSS

$turquoise-tortoise: #457e7b;
$turquoise-tortoise-rgb: 69, 126, 123;
$turquoise-tortoise-light: mix(#fff, $turquoise-tortoise, 20%);
$turquoise-tortoise-dark: mix(#000, $turquoise-tortoise, 20%);

.element {
  color: $turquoise-tortoise;
  box-shadow: 0 0 0 2px rgba($turquoise-tortoise, 0.35);
}